Why do perma-banned people act like they deserved a warning or a second chance?
With the recent waves of bans I've seen this behavior a lot, and it sort of baffles me. People seem to have the skewed opinion that they shouldn't be perma'd from the game or they should have been warned beforehand (sometimes through stupid arguments like "i spent 50000 dollars dis game!" and such).
Here is a heads-up: Even only having a single chat restriction means you're already on the red, and thus it's already a warning.
Riot is already letting you know that you're having your initial rights restricted because your behavior isn't falling into the allowed margin and you're becoming a liability to the community. Most of the cases the restriction/bans scale in gravity due to repeated offenses (I believe isntant perma's are extremely rare), hell, even the pop-up message that reads you have been reported quite a number of times is a warning already.
As for the second-chance point of view, a Perma is basically Riot letting you know that your shit won't be tolerated any longer and you aren't allowed in the building anymore. Speaking of buildings, it'd be the equivalent of an eviction letter because the neighbours have filed several complains about you to the landlord (and even in this scenario, we're assuming LoL would be a subscription based game).
So yeah, considering that in order to be allowed to freely play this game without the fear of being banned all you need to do is behave respectfully toward your peers, step it up and enjoy your stay, hell, you don't even need to be respectful, just not a total asshat. If you can't fullfill this basic requirement, then please clear your room by the end of the month and don't let the door hit you in the way out.